Drug Use Criteria: Benzodiazepines (oral/rectal)

Transcription

1 Texas Vendor Drug Program Drug Use Criteria: Benzodiazepines (oral/rectal) (Not including sedative/hypnotics*) Publication History 1. Developed October Revised March 2018; May 2017; December 2014; March 2013; June 2011; January 2009; April 2003; December 2001; December 2000; December 1999; November 1998; November 1997; December Notes: Information on indications for use or diagnosis is assumed to be unavailable. All criteria may be applied retrospectively; prospective application is indicated with an asterisk [*]. The information contained is for the convenience of the public. The Texas Health and Human Services Commission is not responsible for any errors in transmission or any errors or omissions in the document. Medications listed in the tables and non-fda approved indications included in these retrospective criteria are not indicative of Vendor Drug Program formulary coverage. Prepared by: Drug Information Service, UT Health San Antonio. The College of Pharmacy, The University of Texas at Austin. * Note: Sedative/hypnotic benzodiazepines are included in Sedative/Hypnotics criteria. i

2 1 Dosage 1.1 Adults Non-sedative/hypnotic benzodiazepines are FDA-approved for use in the outpatient setting to manage anxiety (alprazolam, chlordiazepoxide, clorazepate, oral diazepam, lorazepam, oxazepam), panic disorder (alprazolam, clonazepam), acute musculoskeletal (MS) conditions including spasticity (oral diazepam), seizures [clobazam (Lennox-Gastaut syndrome), clonazepam, clorazepate, oral and rectal diazepam], and acute alcohol withdrawal (chlordiazepoxide, clorazepate, oral diazepam, oxazepam).[1-10] The chlordiazepoxide-amitriptyline combination is indicated for depression with associated anxiety symptoms, while chlordiazepoxide/clidinium is FDA-approved for emotional factor control in gastrointestinal disorders as well as adjunctive use in peptic ulcer disease and irritable bowel syndrome.[11, 12] Table 1 summarizes the adult maximum recommended dosages for non-sedative/hypnotic benzodiazepines. Table 1. Adult Benzodiazepine Maximum Recommended Daily Dosages [1-12] Therapy Drug Name Dosage Form/ Strength Treatment Indication Maximum Recommended Dosage alprazolam (Xanax, generics 0.25 mg, 0.5 mg, 1 mg, 2 mg tablets, disintegratin g tablets 0.5 mg, 1 mg, 2 mg, 3 mg extendedrelease tablets 1 mg/ml oral solution anxiety and > 65 years: 4 mg alprazolam panic and > 65 years: 10 mg 1

3 Therapy Drug Name Dosage Form/ Strength Treatment Indication Maximum Recommended Dosage chlordiazepoxid e ( 5 mg, 10 mg, 25 mg capsule alcohol withdrawal (AW) and > 65 years: 300 mg, in divided doses chlordiazepoxid e anxiety 65 years: mild, moderate: 40 mg severe: 100 mg > 65 years: 20 mg clobazam (Onfi ) 10 mg, 20 mg tablets 2.5 mg/ml suspension seizures associated with Lennox- Gastaut syndrome and > 65 years: 20 mg/day (weights 30 kg) 40 mg/day (weights > 30 kg) clonazepam (Klonopin, 0.5 mg, 1 mg, 2 mg tablets mg, 0.25 mg, 0.5 mg, 1 mg, 2 mg disintegratin g tablets panic and > 65 years: 4 mg clonazepam seizures and > 65 years: 20 mg clorazepate (Tranxene, 3.75 mg, 7.5 mg, 15 mg tablets AW and > 65 years: 90 mg clorazepate Anxiety and > 65 years: 60 mg clorazepate Seizures and > 65 years: 90 mg 2

4 Therapy Drug Name Dosage Form/ Strength Treatment Indication Maximum Recommended Dosage diazepam (oral) (Valium, 2 mg, 5 mg, 10 mg oral tablets 5 mg/ml, 5 mg/5 ml oral solution AW and > 65 years: 40 mg diazepam (oral) anxiety and > 65 years: 40 mg diazepam (oral) musculoskeletal conditions and > 65 years: 40 mg diazepam (oral) Seizures and > 65 years: 40 mg diazepam (rectal) (Valium, 2.5 mg, 10 mg, 20 mg rectal gel seizures and > 65 years: 0.2 mg/kg; may be repeated once 4-12 hours after initial dose lorazepam (Ativan, 0.5 mg, 1 mg, 2 mg tablets 2 mg/ml solution Anxiety and > 65 years: 10 mg, in divided doses oxazepam (Serax, 10 mg, 15 mg, 30 mg capsule AW 65 years: 120 mg > 65 years: 60 mg # oxazepam Anxiety 65 years: mild, moderate: 60 mg severe: 120 mg > 65 years: 40 mg 3

5 Therapy Drug Name Dosage Form/ Strength Treatment Indication Maximum Recommended Dosage Combo chlordiazepoxid e/ amitriptyline (Limbitrol, 5 mg/12.5 mg tablets 10 mg/25 mg doublestrength tablets depression with concurrent anxiety symptoms 60 mg chlordiazepoxide / 150 mg amitriptyline in divided doses Combo chlordiazepoxid e/ clidinium (Librax, 5 mg/ 2.5 mg capsule emotional/ somatic factors in gastrointestinal disorders; adjunctive therapy in peptic ulcer disease or irritable bowel syndrome 40 mg/20 mg per day (2 capsules 4 times ) * = Benzodiazepine doses should be reduced to lowest effective dose, if possible, in elderly (patients greater than 65 years of age), to minimize oversedation; these patients more sensitive to pharmacologic effects of these agents + = Dose rounded up to nearest commercially available dose (in multiples of 2.5 mg); should not be administered by caregivers outside the hospital more frequently than one course every 5 days with a maximum of 5 courses per month; not for chronic administration to minimize potential for development of tolerance # = In elderly patients, doses up to 120 mg/day may be needed to treat AW 1.2 Pediatrics Safety and effectiveness of alprazolam and combination therapies, chlordiazepoxide/amitriptyline and chlordiazepoxide/clidinium, in children less than 18 years of age have not been established. [1-5, 9, 11, 12] Clobazam has recently been approved in children 2 years of age and older to manage seizures associated with Lennox-Gastaut syndrome. [1-5, 10] 4

6 With the exception of alprazolam, non-sedative/hypnotic benzodiazepines are indicated for use in pediatric patients to manage anxiety or seizures. Pediatric dosages and age limitations for benzodiazepines are summarized in Table 2. Table 2. Pediatric Benzodiazepine Maximum Recommended Dosages [1-13] Drug Name chlordiazepoxide Treatment Indication alcohol withdrawal (AW) Maximum Recommended Dosage adolescents > 12 years: 300 mg in divided doses chlordiazepoxide anxiety 6 years: 30 mg in divided doses clobazam seizures associated with Lennox-Gastaut syndrome 2 years and older, adolescents 30 kg: 20 mg/day 2 years and older, adolescents > 30 kg: 40 mg/day clonazepam seizures < 10 years or < 30 kg: 0.2 mg/kg in divided doses 10 years or 30 kg: 20 mg in divided doses clorazepate seizures 9-12 years: 60 mg in divided doses > 12 years: 90 mg in divided doses diazepam (oral) musculoskeletal conditions 6 months of age: 10 mg/day in divided doses have been used; dose may be increased as needed and tolerated no maximum dose documented diazepam (oral) seizures 6 months of age: 10 mg/day in divided doses have been used; dose may be increased as needed and tolerated no maximum dose documented diazepam (rectal) seizures+ 2-5 years: 0.5 mg/kg/dose 6-11 years: 0.3 mg/kg/dose 12 years: 0.2 mg/kg/dose lorazepam anxiety 12 years: 10 mg in divided doses (maximum, 2 mg/dose) oxazepam anxiety 6-12 years: dose not established; 1 mg/kg/day in divided doses has been adequate > 12 years: mild, moderate: 60 mg, in divided doses severe: 120 mg, in divided doses + = Dose rounded up to nearest commercially available dose (in multiples of 2.5 mg); should not be administered by caregivers outside the hospital more 5

7 frequently than one course every 5 days with a maximum of 5 courses per month; not for chronic administration to minimize potential for development of tolerance 2 Duration of Therapy [1-25] Anxiety disorders are considered chronic disorders with low spontaneous remission rates and high rates of relapse. Pharmacotherapy for generalized anxiety disorder (GAD) in adults includes antidepressants, benzodiazepines, buspirone, hydroxyzine and pregabalin. Treatment duration for GAD ranges from 3 to 12 months to accomplish treatment goals of symptom remission and improvement in quality of life. Although antidepressants are now considered drugs of choice for managing GAD, benzodiazepines are used frequently for short-term management of anxiety, as an adjunct to initiating antidepressant therapy, or improvement in sleep disturbances associated with GAD and/or antidepressant therapy. Benzodiazepines provide symptom improvement more rapidly than antidepressants and are more effective in managing somatic complaints rather than psychic symptoms. Although longer-term use is considered relatively safe and effective for benzodiazepines, the potential for abuse, dependence and withdrawal does exist. In pediatric patients, selective serotonin reuptake inhibitors (SSRIs) are agents of choice to manage childhood anxiety disorders, with benzodiazepines prescribed as alternatives either alone or concurrently with accepted antidepressant therapy. Panic disorder (PD) is a chronic, recurring condition requiring drug therapy suitable for prolonged use. The acute treatment phase for PD lasts approximately 12 weeks, and most patients require an additional 12 to 18 months of therapy to optimize treatment response and prevent relapse. SSRIs are the agents of choice to manage PD, although benzodiazepines are frequently prescribed as well, usually in combination with antidepressant therapy. While benzodiazepines are effective in the short-term treatment of panic disorder due to rapid onset of action, long-term treatment may be less desirable due to the potential for dependence. Unlike anxiety disorder patients, patients with panic disorder are less successful at discontinuing benzodiazepine therapy. Additionally, there is a high prevalence of comorbid depression and/or bipolar disorder in patients with panic disorder. Benzodiazepines are less effective than other available agents when panic disorder coexists with other mood disorders. Therefore, patients with panic disorder and 6

8 other psychiatric comorbidities may benefit from short-term therapy with a benzodiazepine, with chronic management incorporating mood stabilizing or antidepressant agents that are also effective in panic disorder. Alprazolam has been studied more than other available benzodiazepines for the treatment of panic disorder, although clonazepam, lorazepam, and diazepam have also been evaluated. Most studies evaluating benzodiazepine use in panic disorder have been short-term studies (less than 8 weeks in duration). A few long-term panic disorder studies evaluating alprazolam have demonstrated sustained reductions in panic attack frequency when alprazolam has been administered for 6 to 8 months. Benzodiazepines should be tapered when discontinued, as patients may experience a withdrawal syndrome if therapy is discontinued abruptly. Benzodiazepine elimination half-life and seizure history for the patient also influence the taper duration. Patients receiving benzodiazepines in lower doses for shorter times periods (less than six months) may be effectively tapered over two to eight weeks, while patients receiving benzodiazepines with a short elimination half-life, in higher doses, and/or for a longer duration (six months or longer) may require a slow taper over two to four months. Benzodiazepines should be prescribed on a short-term basis to manage anxiety disorders. Benzodiazepine doses should be tapered rather than discontinued abruptly to avoid withdrawal symptoms. Patients receiving benzodiazepines for up to 6 months should be tapered over 2 to 8 weeks, while patients treated with benzodiazepines for up to 12 months should be tapered over 2 to 4 months. While concerns for benzodiazepine tolerance and withdrawal exist, patients may benefit from long-term use of benzodiazepines in panic disorder to minimize symptom recurrence. Additionally, significant problems with benzodiazepine dose escalation have not surfaced with chronic use for panic disorder. The use of benzodiazepines as an anti-epileptic is not limited in duration. 3 Duplicative Therapy The combined use of two or more benzodiazepines is not supported in the literature and therefore is not recommended. The concurrent use of two or more benzodiazepines will be reviewed. 7

9 4 Drug-Drug Interactions Patient profiles will be assessed to identify those drug regimens which may result in clinically significant drug-drug interactions. Drug-drug interactions considered clinically relevant for nonsedative/hypnotic benzodiazepines are summarized in Table 3. Only those drug-drug interactions identified as clinical significance level 1 or those considered life-threatening which have not yet been classified will be reviewed: [1-5, 7-12, 26] Table 3. Benzodiazepine (nonsedative/hypnotic) Drug-Drug Interactions Target Drug Interacting Drug Interaction Recommendation Clinical Significance Level alprazolam CYP3A4 inhibitors (e.g., azole antifungals, macrolides, NNRT inhibitors, protease inhibitors ) adjunctive administration may result in enhanced oxidized BZD pharmacologic effects and/or toxicity, including significant sedation and/or respiratory depression, as alprazolam is metabolized by CYP3A4 avoid combined therapy with most CYP3A4 inhibitors, if possible contraindicated -azole antifungals, NNRT inhibitors, protease inhibitors; moderate - macrolides 1 severe (azole antifungals, NNRT inhibitors, protease inhibitors); 3- moderate (macrolides) (CP) alprazolam phenytoin combined use may induce alprazolam metabolism and decrease alprazolam pharmacologic effects monitor for reduced alprazolam clinical effects and adjust doses as necessary 3-moderate (CP) 8

10 Target Drug Interacting Drug Interaction Recommendation Clinical Significance Level benzodiazepine s (BZDs) central nervous system (CNS) depressants concurrent administration may potentiate respiratory depression, especially with overdosage monitor for respiratory depression; adjust doses as necessary major 2-major (CP) BZDs sodium oxybate (Xyrem ) combined use may lead to increased respiratory depression due to additive CNS/ respiratory depressive effects adjunctive use should be avoided; if concurrent use necessary, closely monitor for respiratory depression; dosage reductions for one or both medications may be needed major 1-severe (CP) clobazam drugs metabolized by CYP2C19 (e.g., clopidogrel, cimetidine, fluconazole) co-administration may result in increased clobazam serum levels and increased pharmacologic and/or adverse effects as clobazam is partially metabolized by CYP2C19 monitor for enhanced clobazam pharmacologic/ adverse effects; adjust clobazam dose as necessary moderate 3-moderate (CP) 9

11 Target Drug Interacting Drug Interaction Recommendation Clinical Significance Level other oxidized BZDs (chlordiazepoxide, clonazepam, diazepam) CYP3A4 inhibitors [e.g., azole antifungals, macrolides, nonnucleoside reverse transcriptase (NNRT) inhibitors, protease inhibitors] adjunctive administration may result in enhanced oxidized BZD pharmacologic effects and/or toxicity, including significant sedation and/or respiratory depression, as oxidized BZDs are metabolized by CYP3A4 avoid combined therapy, if possible; if concurrent with BZD necessary, monitor for increased sedation, respiratory depression, or consider a BZD metabolized by glucuronidation (e.g., oxazepam) moderate 2-major (protease inhibitors); 3- moderate (azoles, macrolides, NNRT inhibitors) (CP) oxidized BZDs (e.g., alprazolam, chlordiazepoxide, clonazepam, diazepam) CYP3A4 inducers (e.g., carbamazepine, rifamycins) combined use may result in increased oxidized BZD clearance, reduced oxidized BZD serum levels, and decreased pharmacologic effects; oxidized BZDs are metabolized by CYP3A4 monitor oxidized BZD clinical response and adjust dose as needed; may also consider substituting a BZD metabolized by glucuronidation (e.g., oxazepam) moderate 2-major, 3- moderate (CP) 10

12 Target Drug Interacting Drug Interaction Recommendation Clinical Significance Level select BZDs (chlordiazepoxide, diazepam) phenytoin concomitant use may result in unpredictable effects on serum phenytoin levels (may increase, decrease, or not change) due to unknown effect on phenytoin metabolism; phenytoin may induce BZD metabolism, reduce BZD serum levels, and decrease BZD pharmacologic effects closely monitor serum phenytoin levels and observed for altered pharmacologic effects (reduced efficacy, increased toxicity); monitor for reduced BZD clinical effects and adjust doses as necessary major (diazepam), moderate (chlordiazepoxi de) 3-moderate (CP) chlordiazepoxide/ amitriptyline amphetamines combined administration may increase potential for serotonin syndrome as both medications target the serotonin neurotransmitter system if adjunctive therapy is necessary, start with lower doses and monitor for signs/ symptoms of serotonin syndrome; discontinue both medications if serotonin syndrome develops major 2-major (CP) 11

13 Target Drug Interacting Drug Interaction Recommendation Clinical Significance Level chlordiazepoxide/ amitriptyline monoamine oxidase inhibitors increased risk of serotonin syndrome with amitriptyline (e.g., mental status changes, hyperpyrexia, restless, shivering, hypertonia, tremor) due to serotonin metabolism inhibition by monoamine oxidase allow 14 days after MAOI discontinuation before initiating other tricyclic antidepressant therapy contraindicated 1-severe (CP) chlordiazepoxide/ amitriptyline QT intervalprolonging drugs co-administration with QT intervalprolonging drugs may increase risk of QT interval prolongation and torsades de pointes as amitriptyline also prolongs the QT interval avoid concurrent use; if adjunctive use necessary, monitor for increased pharmacologic/ toxic effects; adjust dose as necessary or discontinue therapy contraindicated 1-severe, 2- major (CP) CP = Clinical Pharmacology 5 References 1. DRUGDEX System (electronic version). Truven Health Analytics, Greenwood Village, Colorado, USA. Available at: Accessed March 21, Lexi-Drugs TM. Lexi-Comp Online TM [database online]. Hudson, OH: Lexi- Comp, Inc.; Available at: online.lexi.com.ezproxy.lib.utexas.edu. Accessed March 21,

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